* System Controller Registers R/W driver System controller node represents a register region containing a set of miscellaneous registers. The registers are not cohesive enough to represent as any specific type of device. The typical use-case is for some other node's driver, or platform-specific code, to acquire a reference to the syscon node (e.g. by phandle, node path, or search using a specific compatible value), interrogate the node (or associated OS driver) to determine the location of the registers, and access the registers directly. Required properties: - compatible: Should contain "syscon". - reg: the register region can be accessed from syscon Optional property: - reg-io-width: the size (in bytes) of the IO accesses that should be performed on the device. - hwlocks: reference to a phandle of a hardware spinlock provider node. Examples: gpr: iomuxc-gpr@20e0000 { compatible = "fsl,imx6q-iomuxc-gpr", "syscon"; reg = <0x020e0000 0x38>; hwlocks = <&hwlock1 1>; }; hwlock1: hwspinlock@40500000 { ... reg = <0x40500000 0x1000>; #hwlock-cells = <1>; };